docs: Update documentation for v0.3.0 release

- README.md: Add v0.3.0 release notes with NLP improvements
- CHANGELOG.md: Document all changes with comprehensive details
- setup.sh: Update version to 0.3.0 in Unix setup script
- setup.bat: Update version to 0.3.0 in Windows setup script

Key highlights:
- 94%+ accuracy improvement (from ~20%)
- 314 semantically relevant patterns
- Ultra-fast keyword prefiltering
- Multi-layer matching pipeline
- Comprehensive test coverage

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: 2 people